Automatic ventilation device for chair

ABSTRACT

An automatic ventilation device for chairs uses a moveable plate that moves upwards and downwards along with a cushion, arranged under the cushion. A reset spring for returning is disposed on the removable plate. The upper side and lower side of the removable plate having a stretchable air bag respectively. When the removable plate moves upwards and downwards, one air bag is extended while the other is compressed, working in opposite way. The. upper and lower air bags have one-way air inlets and outlets respectively while the air outlets are connected to the chair cushion and the chair back. Therefore, when the cushion moves due to the movement of users or driving over broken country, the moveable plate moves upwards and downwards synchronously so as to compress one of the upper or lower air bags for blowing air to the chair cushion and chair back continuously. Thus under the condition of energy saving-without a power unit, the device has a cooling effect and makes users comfortable.

BACKGROUND OF THE INVENTION

The present invention relates to an automatic ventilation device for chairs, especially to a ventilation device that take advantages of the

For pursuing greatest comfort of chairs in automobiles or offices, the chairs are designed according to ergonomics principles. And permeability and ventilation of chairs are also considered. Sweat or heat egests from the skin may cause users uncomfortable. Although there is a cushion with air-blowing function, it needs external power sources such as automotive batteries to drive a fan or a pump for blowing air so as to achieve good ventilation.

SUMMARY OF THE INVENTION

Therefore it is a primary object to provide an automatic ventilation device for chairs that uses a removable plate disposed in a cushion and moves upwards and downwards along with the cushion. Reset springs are arranged on the removable plate and an upper air bag as well as a lower air bag are also disposed on the removable plate. While the removable plate moves upwards and downwards, one of the air bag extends while the other air bag compresses. Moreover, one-way air inlets as well as air outlets are arranged on the upper and lower air bags and the air outlets connect to surfaces of chair seat and chair back in contact with users. While driving over rough road or changing the sitting posture, the removable plate moves upwards and downwards along with the movement of the cushion so as to make one of the air bags compress to exhaust air therein while the other air bag extends to input air.

Thus the air is blowing to the chair seat or the chair back. For saving energy without power unit, the device has a cooling effect and makes users comfortable.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an assembling view of an embodiment in accordance with the present invention assembled with a chair seat;

FIG. 2 is an explosive view of the embodiment with the chair seat in FIG. 1;

FIG. 3 is a perspective view of an embodiment in accordance with the present invention;

FIG. 4 is a cross-sectional view of the embodiment with the chair seat in FIG. 1;

FIG. 5 is a schematic drawing showing air flow while an embodiment in accordance with the present invention is moving downwards;

FIG. 6 is a schematic drawing showing air flow while an embodiment in accordance with the present invention is moving upwards;

FIG. 7 is a cross-sectional view of another embodiment in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Refer from FIG. 1 to FIG. 4, an automatic ventilation device for chairs 1 of the present invention is assembled with a cushion 20 of a chair 2. The present invention consists of an upper stretchable air bag 10, a lower stretchable air bag 11. a moveable plate 12 moving upwards and downwards arranged between the two air bags 10, 11, and a plurality of reset spring 13 that returns the moveable plate 12 to original position. The moveable plate 12 is connected with and arranged under the cushion 20 of the chair 2 to form a couple, moving together. There is no limitation in the way of connection while the moveable plate 12 and the cushion 20 move upwards and downwards synchronously under a certain range of height. The upper and lower stretchable air bags 10, 11 are extended or compressed vertically and are disposed on upper side and lower side of the removable plate 12. When the removable plate 12 moves upwards and downwards, one of the upper and the lower air bags 10, 11 is extended for intake of air while the other is compressed for exhausting gas-acting in opposite way. Moreover, each of the stretchable air bags 10, 11 has their respective one-way air intakes 101, 111 and one-way air outlets 102, 112 for intake and exhausting of air. When the upper and the lower air bags 10, 11 are extended, air enter into the air bags 10, 11 through the air intakes 101, 111 respectively. When upper and the lower air bags 10, 11 are compressed, air are expelled form the air bags 10, 11 through the air outlets 102, 112. Furthermore, the air outlets 102, 112 of the air bags 10, 11 are connected to outer surface of the cushion 20 or a seat back 21 of the chair 1 by a connecting duct 30. Thus the air exhausted from the air bags 10, 11 is blowing out of the cushion or the seat back 20, 21 through the ventilation structure thereof to cool users. There are various design of the ventilation structure on the cushion 20 or the seat back 21 such as vent holes 202 on sponge 201 therein or breathable fabric on surface of the sponge thereof. Thus the sponge of the cushion 20 or the seat back 21 is breathable and comfort.

Moreover, a box-shaped lower frame 14 is used as a base. The upper and lower air bags 10, 11 with the removable plate 12 on the middle thereof are arranged inside inner space of the lower frame 14 while the top surface 103 and bottom surface 104 of the upper air bag 10 are connected with an inner top surface 141 of the lower frame 14 and an upper plate 121 of the removable plate 12 respectively. Moreover, the removable plate 12 is capable of moving upwards and downwards inside the inner space between the removable plate 12 and the lower frame 14 by vertical guiding rails 120. The guiding rails 120 consist of a plurality of guiding block 123 disposed on the removable plate 12 and a plurality of corresponding guiding slot 143 in vertical direction on the lower frame 14. The guiding blocks 123 moves vertically inside the guiding slots 143. Furthermore, a C-shaped upper frame 15 for shielding is covered on top of the lower frame 14, used the guiding blocks 123 as load bearing points so as to make the upper frame 15 moves vertically along with the removable plate 12, corresponding to the lower frame 14. The upper frame 15 is arranged on the bottom of the cushion 20 of the chair 2 so that the upper frame 15 and the cushion 20 move together. Reset springs 13 having a plurality of compression spring are set between the upper frame 15 and the lower frame 14. Once the combination of the cushion 20, the upper frame 15 and the removable plate 12 moves downwards to compress the springs 13, they will return to the original position by restoring force of the springs 13.

When users sit on the cushion 20 of the seat 2 and moves upwards or downwards along with the movement of the cushion 20 while driving over rough road or changing the sitting posture. Refer to FIG. 5, the combination of the cushion 20, the upper frame 15 and the removable plate 12 moves downwards, the upper air bag 10 extends while the lower air bad 11 compresses to exhaust air inside through the air outlet 112 that connects to the surfaces of the cushion 20 of the chair seat 2 or the chair back 21 by the connecting duct 30. While when the combination of the cushion 20, the upper frame 15 and the removable plate 12 moves upwards by the action of the reset springs 13, as shown in FIG. 6, the lower air bag 11 extends for inputting air while the upper air bag 10 compresses to exhaust air therein through the air outlet 102 thereof that connects to the surfaces of the cushion 20 of the chair seat 2 or the chair back 21 by the connecting duct 30. Therefore, there is blowing air while the cushion 20 moves upwards or downwards. Under the condition of no power unit, the device has a cooling effect and makes users comfortable.

There is no limits on disposition way or position of the connecting ducts 30, one-way air inlets 101, 111 and air outlets 102, 112 arranged on the upper air bag and lower air bag 10, 11. The air inlets 101, 111 and air outlets 102, 112 are connected to the chair seat 20 or the chair back 21 by the exposed connecting ducts 30, as shown in FIG. 3 & FIG. 4, or by the inner connecting ducts 30, as shown in FIG. 7 so that the air inlet 111, the air outlet 112, and the connecting ducts 30 pass through the top side 113, the removable plate 12, the upper air bag 10, the upper frame 15; and finally connect to the chair seat 20 or chair back 21 so as to avoid exposure of ducts and save space. In addition, the present invention can be applied to various kind of chairs such as automobile chairs, chairs of scooters, bicycle chairs or office chairs. The size of the automatic ventilation device for chairs 1 can be modified according to the size of the chairs. The automatic ventilation device for chairs 1 in accordance with the present invention can be modularized and downsized.

Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. 

1. An automatic ventilation device arranged under a chair cushion comprising a lower frame, an upper frame, an upper and a lower stretchable air bags, and a removable plate moving upwards and downwards, and reset springs, wherein the lower frame is box-shaped and the upper and lower air bags with the removable plate on the middle thereof are arranged inside inner space of the lower frame while the top surface and bottom surface of the upper air bag are connected with an inner top surface of the lower frame and an upper plate of the removable plate respectively; the removable plate is capable of moving upwards and downwards inside the inner space between the removable plate and the lower frame by vertical guiding rails; the upper frame that is a shielding frame arranged above the lower frame connected with the removable plate inside the lower frame and the cushion of the chair so as to move upwards and downwards together, corresponding to the lower frame; the moveable plate arranged between the upper and the lower air bags and connected with the upper frame as well as the cushion to form a connecting body that moves upwards and downwards synchronously under a certain range of height; the upper and lower stretchable air bags having respective one-way air intakes and air outlets are disposed on upper side and lower side of the removable plate respectively; When the removable plate moves upwards and downwards, one of the upper and the lower air bags is extended for intake of air while the other is compressed for exhausting gas-working in opposite way; the one-way air outlets of the upper and the lower air bags are connected to the chair cushion or seat back by a connecting duct so as to exhaust air through ventilation structure on the cushion or the seat back; reset springs set between the upper frame and the lower frame for providing restoring force to make a connecting body formed by the cushion, the upper frame and the removable plate return to the original position while moving downwards and upwards, corresponding to the lower frame; when the cushion moves upwards and downwards, the removable plate moves upwards and downwards synchronously so as to compress one of the lower and upper air bags to exhaust air while the other air bag extends to intake air for blowing air to the cushion or the seat back.
 2. The device as claimed in claim 1, wherein the ventilation structure on the cushion or the seat back having vent holes vertically arranged on sponge on the cushion or the seat back or breathable fabric on surface of the sponge.
 3. The device as claimed in claim 1, wherein the guiding rails arranged between the removable plate and the lower frame includes a plurality of guiding block disposed on the removable plate and a plurality of corresponding guiding slot mounted vertically on the lower frame so that the guiding blocks moves vertically inside the guiding slots and the upper frame used the guiding blocks as load bearing points so as to make the upper frame moves vertically along with the removable plate.
 4. The device as claimed in claim 1, wherein there is no limitation on the method or location of disposition of the one-way air intakes, the one-way air outlets, or the connecting ducts on the upper and lower air bags.
 5. The device as claimed in claim 4, wherein the air outlets and the connecting ducts on the upper and lower air bags are connected with internal part of the cushion or the seat back and are exposed outside.
 6. The device as claimed in claim 4, wherein the air outlets and the connecting ducts on the upper and lower air bags are connected with internal part of the cushion or the seat back and are hidden inside.
 7. The device as claimed in claim 6, wherein the air outlet of the lower air bag as well as the connecting ducts pass through the removable plate, the upper air bag, the upper frame, and connect to inner side of the chair seat or the chair back while the air outlet of the upper air bag as well as the connecting ducts pass through the upper frame and then connect to inner side of the chair seat or the chair back. 